| Abstract: | Individual cellulose crystallites from the cell wall of Valonia ventricosa have been studied by electron diffraction and observed by dark-field electron microscopy. These two techniques reveal that the crystalline zones which run along the fibrils are above 1000 Å in length without any longitudinal periodicity. The width of the crystallites covers the width of the microfibrils and ranges from 140 to 180Å without persistent 35 Å subunits. In several instances, the crystalline zones terminate in the manner of a fork with two arms of 30 to 40 Å in width. |
